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406 Flashcards

1
Q

1 tailed hypothesis

A

Specifies direction

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2
Q

2 tailed hypothesis

A

Can go in any direction

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3
Q

Within groups

A

All in one groups

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4
Q

Between groups

A

2 or more groups

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5
Q

The sampling distribution of the mean indicates …

A

A distribution OF sample means

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6
Q

Statistical significance

A

The probability of making a type 1 error

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7
Q

Type 1 error

A

Falsely retain the H1

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8
Q

Type 2 error

A

Falsely retain H0

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9
Q

Descriptive statistics are primarily used to….?

A

Summarise sets of data

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10
Q

When recording time in seconds, which scale of measurement is implied?

A

Ratio

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11
Q

What is the level of data associated with the median ?

A

Ordinal

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12
Q

The mean, mode and median are generally described as…

A

Measures of central tendency

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13
Q

Given that 20% of cat owners prefer dogs, to the nearest whole number, out of 24 cat owners, how many prefer dogs?

A

5

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14
Q

The sampling distribution of the mean indicates…

A

A distribution of sample means

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15
Q

Assuming the population is normally distributed, what is the mean of the sampling distribution?

A

The population mean

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16
Q

Assuming the population is normally distributed, what is the standard deviation of the sampling distribution?

A

The standard deviation of the population divided by the square root of the sample size

17
Q

Which of the following is most likely to lead to a non-normally distributed sampling distribution of the mean for a given sample size?

A

A skewed population distribution

18
Q

A one tailed p-value was reported as 0.08, what is it’s two tailed p-value?

A

0.16

19
Q

A p-value corresponds to…?

A

The probability of making a type 1 error

20
Q

Not an assumption of the one sample t-test

A

DV normally distributed in the sample

21
Q

In order for a calculated value of t to be significant it has to be …

A

Bigger than the critical value

22
Q

Which famous brewery did the inventor of the t-test work for?

A

Guinness

23
Q

What type of chart would you use to display a continuous frequency distribution?

A

Histogram

24
Q

Sums of Squares (SS) provides a measure of?

A

The total variability in a data set

25
Q

Variance provides a measure of..

A

The mean variability in a data set?

26
Q

Given that a set of 100 numbers has a sums of squares of 16, what is the variance of the set of numbers?

A

0.16

27
Q

Given that a set of 100 numbers has a variance of 16, what is the standard deviation of the set of numbers?

A

4

28
Q

Measures such as the standard deviation and range are generally described as

A

Measures of dispersion

29
Q

If a set of scores are normally distributed.. what percentage of scores (approx.) would you expect to fall within the mean and one standard deviation above the mean?

A

34%

30
Q

A standard score (Z score) is one which…

A

Is expressed as the scores distance from the mean in standard deviations

31
Q

Given that a normal distribution has a mean of 100 and a standard deviation of 10, what is the corresponding standard score (Z score) associated with a raw score of 115?

A

1.5

32
Q

For the numbers
1,2,4,4,5,8
What is the upper quartile (Q3)

A

5.75

3(n+1)/4

33
Q

What is the range of …

1,2,4,4,5,8

A

7

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